.left-side {
  width: 180px;
  position: absolute;
  top: 0;
  left: 0;
  background: #eff0f0;
}
.sticky-left-side {
  position: fixed;
  height: 100%;
  overflow-y: auto;
  z-index: 100;
}
.custom-nav {
  margin-bottom: 10px;
}
.main-content {
  margin-left: 180px;
  background: #eff4f4;
  min-height: 1000px;
}